[Coin-ipopt] LIWMA/LA problem?

Kranthi K Gade kranthi at cs.nyu.edu
Sat Dec 4 23:34:37 EST 2004


Hello all,

I have been trying to use IPOPT to optimize a problem with around 2000 
variables and 2 constraints.  The program gives seg fault on iteration 1.

Here's the output:

******************************************************************************
This program contains IPOPT, a program for large-scale nonlinear 
optimization.
    IPOPT is released as open source under the Common Public License (CPL).
    For more information visit www.coin-or.org/Ipopt
******************************************************************************

Number of variables           :     2105
    of which are fixed         :        0
Number of constraints         :        2
Number of lower bounds        :        2
Number of upper bounds        :        0
Number of nonzeros in Jacobian:     4210
Number of nonzeros in Hessian :     2105

ITER     ERR       MU      ||C||   ||YPY||  ||PZ||     ||D||   ALFA(V) 
ALFA(X)     NU   #LS       F      #cor   Regu    CPU(s)
0 .987E+05p .100E+00 .140E+06 .000E+00 .000E+00  .000E+00 .000E+00 
.000E+00  .000E+00  0 -.57231356E+03  0 .000E+00 .313E-01

ma27_call:  LIWMA increased from 73675 to 1307435
ma27_call:  LA increased from 63145 to 1307435

1 .134E+06p .100E+00 .138E+06 .000E+00 .000E+00  .621E+04 .976E+00d 
.100E+01h .000E+00  1 -.82994516E+03  2 .100E-03 .938E-01

Can somebody tell me what are these LIWMA and LA?  And is there a 
problem if they are increased?  Also is there a good source (FAQ list or 
something) to which I can refer to when faced with such problems?

I am attaching some debugging information just in case you might find it 
useful.

Thanks a lot.
kranthi
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